Grace hit the first basket of overtime, and Quinton Doggett’s layup gave the Jaguars (13-11, 9-2 Southwestern Athletic Conference) a 45-41 lead.
Jonathan Lewis’ 3-pointer brought the Tigers (5-18, 3-8) within a point, but a jumper by Grace made it 47-44 with 48 seconds left. After Jackson State’s Kelsey Howard missed a 3-point try, two free throws by Grace provided the final margin.
Sydney Coleman’s layup for Jackson State with 5 seconds left in regulation sent the game to overtime tied 41-41.
Doggett finished with 12 points and 12 rebounds for Southern, which has won five in a row and defeated Jackson State 68-37 on Jan. 9.
Howard scored 16 for Jackson State, which shot 22.7 percent (15 of 66) for the game to Southern’s 37.8 percent (17 of 45).